Switch for dynamo-electrig machines



(No Model.)

W. H-OGHHAUSEN.

SWITCH FOR DYNAMO ELECTRIC MACHINES. No. 413,280. Patented Oct. 22, 1889..

wvemtoa WW 7/1/7294 W J/atZZauJen/ 3 314, r/ d aw UNITED STATES PATENT OFFICE.

\VlLLIAlvl llOClll-IAUSEN, OF BROOKLYN, KEV? YORK.

SWITCH FOR DYNAMO-ELECTRlC MACHENE.

SPECIFICATION forming part of Letters Patent No. 413,280, dated Ostober 22, 1889.

Application filed March 12, 1889. Serial No. 303,013. (No model.)

To all whom it may concern:

Be it known that I, W ILLIAM HOCHHAU- SEN, a citizen of the United States, and a resident of Brooklyn, in the county of Kings and State of New York, have invented a certain new and useful Switch for Dynamo-Electric Machines, of which the followingis a specification.

My invention relates to switch apparatus for throwing off the supply of current from a dynamo-machine to a working-circuit containing incandescent lamps or other translating devices, and applies more especially to dynamo-machines in which the field-magnet is excited by coils carrying current developed by the machine itself and flowing through the coils in derived circuit to the work, although it may also be applied to other arrangements, as will be obvious to electricians.

The object of my invention is to provide a switch device whereby the machine may be thrown quickly out of action and the flow of current on the working-circuit stopped with out the production of a destructive spark and without endangering the insulation of the field-magnet coils.

In the accompanying drawing 1 have illustrated, in plan and diagram, an apparatus embodying my invention.

0 indicates the coils of the field-magnet for a dynamoelectric machine, the armature of which feeds incandescent lamps M or other devices. The coils O are shown in the present instance as placed in derived circuit to the work, and in such case are preferably of high resistance. The circuit including the fieldinagnet coils O is controlled by the electric switch S, which may be operated to complete a shunt 12 around such coils. Owing to the great number of convolutions of wire in the field-magnet coil, it is obvious that if the mag netism of the field magnet be suddenly stopped there would arise an extra current of high electro-motive force that would tend to break through the insulation of the coils. In order to avoid such danger, I throw such coils out of action by completing a shunt around them instead of by breaking the circuit through them, and I preferably combine with the switch an artificial resistance so arranged that it may be introduced gradually into the normal circuit through the coils 0 before the completion of the shunt 12 around such coils. By introducing this resistance, so as to oppose gradually a greater and greater resistance to the flow of magnetizing current through the coils O, the field magnetism is gradually decreased until finally, when the shunt 12 is completed, so as to cause the magnetism to cease entirely, there is such little magnetism that but little extra current will be set up on throwing the magnet entirely out of action.

The shunteontact for switch S is indicated at XV, while 1V indicates the artificial resistance connected to a series of contactplates T in the ordinary and well-known manner. The right-hand contact-plate of the series T is connected directly to the armature-circuit, so that, as will be seen from the figure, the switch will, when in contact with said plate, complete a circuit directly for the field-mag net coils O in derived circuit around the working-circuit. As the switch is moved to the left more and more of the resistance V is introduced into the circuit of coils 0, thus gradually weakening the flow in the same until finally, when the switch S reaches the shunting-contact N, the whole of the resistance is in circuit. The completion of the shunt 12 by the making of contact at 1V causes the magnetism of the field-magnet to die away entirely, thus preventing the armature from generating any current for the external circuit containing the lamps.

My present invention originally formed a part of an application for patent filed by me February 1, 1886, Serial No. 190,517.

\Vhat I claim as my invention is 1. The combination, with a dynamo-electric machine, of a switch connected to a field-magnet coil of said machine, a shunt around said coil connected with a contact of a switch, an artificial resistance, and means controlled by said switch for introducing such resistance gradually into the circuit containing the coil immediately before the completion of the shunt, as and for the purpose described.

2. The combination, with a dynamo-electric machine, of a switch for throwing the same out of action, an artificial variable re sistance connected to the circuit of the fieldmagnet, and means controlled by said switch for gradually varying the resistance to cut closed by the operation of said switch pre- IO down the field magnetism before the switch viously to the completion of the shunt.

stops the flow of current through the field- Signed at New York, in the county of New magnet coils, for the purpose described. York and State of New York, this 21st day of 3. The combination, with a dynaino-elec- January, A. D. 1889. h

tric machine, of a shunt around the field- WILLIAM HOCHHAUSEN.

magnet coil of the machine, a switch for comitnesses:

pleting said shunt, and an artificial resistance WM. H. OAPEL,

having its initial contact in position to be G. WV. HOPKINS: 

